A comparative study of the regulation of Ca2+ of the activities of the 2-oxoglutarate dehydrogenase complex and NAD+-isocitrate dehydrogenase from a variety of …

JG McCORMACK, RM Denton - Biochemical Journal, 1981 - portlandpress.com
JG McCORMACK, RM Denton
Biochemical Journal, 1981portlandpress.com
Ca2+ was shown to activate oxoglutarate dehydrogenase and NAD+-isocitrate
dehydrogenase from heart and other rat tissues by markedly decreasing the Km values of
the enzymes for their respective substrates [see Denton & McCormack (1980) FEBS Lett.
119, 1-8]. Similar effects of Ca2+ were observed in the present study with both enzymes from
other vertebrate sources (pigeon, trout, frog and human heart), but not with the enzymes
from blowfly or locust flight muscle, or potato or Escherichia coli. In contrast, the Km values of …
Ca2+ was shown to activate oxoglutarate dehydrogenase and NAD+-isocitrate dehydrogenase from heart and other rat tissues by markedly decreasing the Km values of the enzymes for their respective substrates [see Denton & McCormack (1980) FEBS Lett. 119, 1-8]. Similar effects of Ca2+ were observed in the present study with both enzymes from other vertebrate sources (pigeon, trout, frog and human heart), but not with the enzymes from blowfly or locust flight muscle, or potato or Escherichia coli. In contrast, the Km values of the oxoglutarate dehydrogenases were affected by ADP, ATP and H+ to a similar extent in every case, except for the enzyme from E. coli, which was not sensitive to regulation by these agents.
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